SenseNet.ContentRepository.CryptoApi.Decrypt C# (CSharp) Метод

        public static string Decrypt(string input, string passphrase, string IVString)
        {
            var provider = new RijndaelManaged();
            var hashMD5 = new MD5CryptoServiceProvider();
            byte[] key = hashMD5.ComputeHash(System.Text.ASCIIEncoding.ASCII.GetBytes(passphrase));
            byte[] IV = hashMD5.ComputeHash(System.Text.ASCIIEncoding.ASCII.GetBytes(IVString));

            provider.Mode = CMode;


            byte[] inputbytes = HttpServerUtility.UrlTokenDecode(input); //Convert.FromBase64String(input);

            var ms = new MemoryStream();
            var cs = new CryptoStream(ms, provider.CreateDecryptor(key, IV), CryptoStreamMode.Write);

            cs.Write(inputbytes, 0, inputbytes.Length);

            cs.FlushFinalBlock();
            ms.Position = 0;
            string res = new StreamReader(ms).ReadToEnd();
            return res;
        }